Open the locked door to the south. You can use this opportunity to get the chest in the next room (where the floor collapsed) if you missed it. Otherwise, head south into the open area with the spider seal. You can now use the chain hooks to cross the area where the bridge collapsed.

Keep backtracking to the south until you are ambushed by the second Loom Warden. You probably won't have your Chaos Form recharged for this battle, so use Blade Geysers to soften up the arachnid. Try to catch her spawn in the process.

Hit her with sword attacks until an Instant Kill prompt appears. Head west from here in to the room with two short passages leading off to the west. Take the south passage and look for a chain hook at the top of the small room. Use the Abyssal Chain to grapple up to the ledge and score the Champion Artifact (Champion Artifact 3). It's high above the room with the bomb block and elevators.

Drop to the very bottom of the room with the bomb block and elevators. Exit into the alleyway and climb the stairs (where you found the artifact earlier). At the top, face west. You should see a chain hook on a ledge above.

To get into this area you'll need to double jump and activate the Abyssal Chain at the height of your jump. This should pull you into a room with chests. In one Chest (Iron Canopy 16/27) you'll find the Hoardseeker, which reveals the remaining chests. Another Chest (Iron Canopy 17/27) has health and the final Chest (Iron Canopy 18/27) contains Souls.

Use your map to find the next Loom Warden. Just take the door at the end of the alley into the room with the transparent floor. The Warden hangs upside-down in this room, so you'll need to yank her off the ceiling with your Abyssal Chain before removing her carapace. She's flanked by Undead Lords (why are they defending her?) so activate your Chaos Form to wipe out the lot of them. Three down!

Now, head east into the main entrance area. You should see three chests marked clearly on your map here. Use the Abyssal Chain to grapple over to the chests. One Chest (Iron Canopy 19/27) contains health, another Chest (Iron Canopy 20/27) contains Wrath and the third Chest (Iron Canopy 21/27) has 100 Souls inside.

It's time to find another spider. Open the door to the north and grapple the final Loom Warden. She'll fall through the floor below, opening up a new area to explore.

You'll have to defeat her first, however. Use the same method you used on the last three to break the another seal on the door -- but what's this? It still seems to be sealed! Unfortunately, a large foe stands between you and a fully unlocked door. Grab the health in the Chest (Iron Canopy 22/27) and head west to meet this foe.